Development and Application of Dynamic Water Quality Model in Nakdong River

동적수질해석모형의 개발과 낙동강에의 적용

  • Kwon, Na-Young (School of Archi. & Civil Engineering, Kyungpook National Univ.) ;
  • Choi, Hyun-Gu (School of Archi. & Civil Engineering, Kyungpook National Univ.) ;
  • Yu, Jae-Jung (Nakdong River Water Quality Research Center, National Institute of Environmental Research) ;
  • Han, Kun-Yeun (School of Archi. & Civil Engineering, Kyungpook National Univ.)
  • 권나영 (경북대학교 공과대학 건축.토목공학부) ;
  • 최현구 (경북대학교 공과대학 건축.토목공학부) ;
  • 유재정 (국립환경과학원 낙동강물환경연구소) ;
  • 한건연 (경북대학교 공과대학 건축.토목공학부)
  • Published : 2010.03.31


The objective of this study is to develop an accurate and stable dynamic water quality model which is capable of reflecting various flows and irregular cross sections and handling numerical oscillations under the low flow conditions. In order to solve the oscillation problem under the low flow conditions, diffusive wave method was applied to the low flow condition in developing a hydraulic model, DyHYD. DyQUAL is also developed as a water quality model to calculate up to 12 water quality variables including autochthonous BOD, water temperature, DO, TN and TP. The developed model is applied to both hypothetical river channels and actual Nakdong river watershed. Additionally, the applicability and reliability of the models are verified by comparing simulation results with observed values. Nash-Sutcliffe coefficients are estimated by comparison between simulation results and observed values. In the calibration and verification process, the coefficients varies from 0.391 to 0.591 and 0.704 to 0.902 for discharge, BOD, TN and TP, respectively.


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